Smith Lake
Washington County, WisconsinLimited DataMesotrophic
Smith Lake comes in at a B on the grading rubric — a respectable showing for a Wisconsin lake of its size and depth. Sub-grades cluster within a single letter of each other, which usually means the lake is in stable trophic balance rather than fighting one specific stressor.
Mesotrophic conditions dominate at Smith Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. At 85 acres, Smith Lake sits below the Wisconsin median: a small water where shoreline activity has an outsized effect on water quality. Within the 15 graded lakes of Washington County, Smith Lake sits at rank 14, near the bottom of the county list.
No invasive species are currently listed at Smith Lake — the lake remains off the Wisconsin infested-waters roster. The fishery is bass-led, with 3 documented species across the lake's records. Public access is available — the lake is on the Wisconsin DNR public-access list. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-10-30. Grade methodology: LakeGrade methodology.
Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Good clarity, visible to about 13.1 ft. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 13.1 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 40 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 85 acres |
| Public Access | Yes |
Fish Species
Click a species to see all Wisconsin and Minnesota lakes where it is found.
→ Best fishing times for Smith Lake (14-day solunar calendar)
→ Is it safe to eat fish from Smith Lake? (mercury & PFAS guide)
→ Smith Lake fishing regulations (limits, seasons, special rules)
Recreation & Access
Location
County Ranking
Ranked #14 of 15 lakes in Washington County
Cleaner Lakes Within 30 Miles
Smith Lake holds Grade B. 5 nearby lakes hold higher grades.
- AGreen LakeWashington County · 4.5 mi · Higher grade (B → A)
- ABig Cedar LakeWashington County · 5.6 mi · Higher grade (B → A)
- ALittle Cedar LakeWashington County · 6.8 mi · Higher grade (B → A)
- ABig Cedar Lake-North Site-Near West BendWashington County · 5.8 mi · Higher grade (B → A)
- ABig Cedar Lake-South Site-Near West BendWashington County · 7.8 mi · Higher grade (B → A)
Nearby Lakes in Washington County
More Wisconsin Lake Rankings
State Parks Near Smith Lake
Other Grade B Lakes in Wisconsin
Mesotrophic Lakes in Wisconsin
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 2025. 1 station on file (most recent sample 2025).
Fish Species (DNR-rated)
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Fish and recreation data from Wisconsin DNR Lakes
Most recent sample: 2025-10-30
Monitoring stations: 1